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post_mist_002 is based on http://www.iquilezles.org/www/articles/fog/fog.htm
This work is licensed under the Creative Commons Attribution 4.0 International License.
To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
post_mist_002 is based on http://www.iquilezles.org/www/articles/fog/fog.htm